Claude Opus 4.8 vs Gemini 2.5 Flash
Benchmarks, API pricing and specs, head to head. Data updated 2026-06-10.
Claude Opus 4.8
Anthropic · May 2026
Anthropic's flagship Opus with adaptive thinking, effort controls and a 1M context — 88.6% on SWE-bench Verified at $5/$25.
Gemini 2.5 Flash
Google · Jun 2025
The 2025 fast-tier favorite: hybrid reasoning, full multimodality and a 1M context at $0.30/$2.50.
The verdict
Claude Opus 4.8 wins 2 of the 2 benchmarks these models share, against 0 for Gemini 2.5 Flash. On price the gap is dramatic: Gemini 2.5 Flash works out roughly 12x cheaper per blended million tokens. Gemini 2.5 Flash also takes 1.0M of context versus 1M for Claude Opus 4.8.
Benchmark head-to-head 2–0
Specs & pricing
| Claude Opus 4.8 | Gemini 2.5 Flash | |
|---|---|---|
| modhub Index | — | — |
| Input price / 1M | $5 | $0.3 |
| Output price / 1M | $25 | $2.5 |
| Context window | 1M | 1.0M |
| Max output | 64K | 66K |
| Open weights | no | no |
| Reasoning model | yes | yes |
| Multimodal input | text, image | text, image, audio, video |
| Knowledge cutoff | Mar 2026 | Jan 2025 |
| Released | May 2026 | Jun 2025 |
| Example monthly cost* | $87.50 | $6.75 |
* 10M input + 1.5M output tokens per month at list prices, no caching. Green = better value on that row.
Frequently asked questions
- Which is better, Claude Opus 4.8 or Gemini 2.5 Flash?
- Claude Opus 4.8 wins 2 of the 2 benchmarks these models share, against 0 for Gemini 2.5 Flash. On price the gap is dramatic: Gemini 2.5 Flash works out roughly 12x cheaper per blended million tokens. Gemini 2.5 Flash also takes 1.0M of context versus 1M for Claude Opus 4.8.
- Which is cheaper, Claude Opus 4.8 or Gemini 2.5 Flash?
- Claude Opus 4.8 costs $5/$25 per million input/output tokens, while Gemini 2.5 Flash costs $0.3/$2.5. For a typical workload of 10M input and 1.5M output tokens per month, that's $87.50 versus $6.75.
- Which model is better for coding, Claude Opus 4.8 or Gemini 2.5 Flash?
- On SWE-bench Verified — the standard agentic-coding benchmark — Claude Opus 4.8 scores 88.6% versus ~48.9% for Gemini 2.5 Flash, making Claude Opus 4.8 the stronger pick for coding agents.
More comparisons
Claude Opus 4.8 vs GPT-5.5Gemini 2.5 Flash vs GPT-5.5Claude Opus 4.8 vs GPT-5.2Gemini 2.5 Flash vs GPT-5.2Claude Opus 4.8 vs GPT-5.1Gemini 2.5 Flash vs GPT-5.1Claude Opus 4.8 vs GPT-5Gemini 2.5 Flash vs GPT-5Claude Opus 4.8 vs GPT-5 miniGemini 2.5 Flash vs GPT-5 miniClaude Opus 4.8 vs OpenAI o3Gemini 2.5 Flash vs OpenAI o3